Bytewave's Workshop Adder for Garry's Mod

--[[
-------------------------------------
- Bytewave's Worksohp Adder         -
-                                   -
- Adds maps for client download     -
- based on the server's current map -
- as well as general addons         -
-                                   -
- For free public use               -
-------------------------------------

INSTRUCTIONS:
Place this file in lua/autorun/server.
Name it something easy-to-remember, such as workshop.lua.
Edit this file where you are told. Do not touch
any other part of this file unless you have no Lua knowledge

FINDING AN ADDON'S ID:
Look at the addon's URL in the Steam browser (make sure you can
actually see links in the Steam browser, there's a setting
for it under Interface I believe).
Search for this:
?id=xxxxxxxxx
Copy that string of numbers, and there ya' go.
]]--

-- EDIT HERE:
-- Add each addon ID on a new line, followed by a comma
-- Do not place a comma on the final line

local ADDONS = {
    123456789,
    987654321,
}

-- Add maps in this format:
-- <mapname> = <Workshop ID>
-- Add a comma to each line until the end

local MAPS = {
    some_map_name  = 123456789,
    some_other_map = 987654321,
}

-- Do not edit anything below this line!
-- (Unless you know what you're doing, of course.)

local players = player.GetAll()
local format  = string.format

-- I like making things look pretty. Don't judge me.
local function PChatToAll(msg)
    for _, ply in pairs(players) do
        if ply and IsValid(ply) then
            ply:ChatPrint(format("[WORKSHOP]: %s", msg))
        end
    end
end

local function PSLog(msg)
    ServerLog(format("[WORKSHOP]: %s\n", msg))
end

local function EchoAll(msg)
    PSLog(msg)
    PChatToAll(msg)
end

-- Make some global variables to not call
-- game.GetMap() and table.Count() every time
local curMap     = string.lower(game.GetMap())
local addonCount = table.Count(ADDONS)

EchoAll("Starting Workshop operations, expect chat spam!")

--[[-----------
  Addon Adder
-----------]]--

EchoAll("Adding Workshop addons to client downloads...")

for num, ID in pairs(ADDONS) do
    EchoAll(format("Adding addon %d (%d of %d) for client download...", ID, num, addonCount))

    -- tostring() because someone thought it'd be a good idea
    -- to make resource.AddWorkshop take a string instead
    -- of a number
    resource.AddWorkshop(tostring(ID))

    EchoAll(format("Addon %d (%d of %d) added.", ID, num, addonCount))
end

--[[---------
  Map Adder
---------]]--

local curMapID = MAPS[curMap]

EchoAll(format("Server playing on map %q. Attempting to add this map for client download...", curMap))

if not (curMapID == nil) then
    EchoAll(format("Adding map %q (ID: %d) for client download...", curMap, curMapID))

    -- tostring() because someone thought it'd be a good idea
    -- to make resource.AddWorkshop take a string instead
    -- of a number
    resource.AddWorkshop(tostring(curMapID))

    EchoAll(format("Map %q (ID: %d) added.", curMap, curMapID))
else
    EchoAll(format("Map %q not found in the MAPS table!", curMap))
end

-- We're done here, now let's say we're done
EchoAll("All Workshop operations complete! Sorry for the spam!")